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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)


Jan
21
reviewed Reviewed Product Measure - proof
Jan
21
reviewed No Action Needed Why can matrix exponentiation be done by squaring?
Jan
21
reviewed Leave Open Why isn't $y=(x^6)^{1/3}$ a polynomial function?
Jan
19
reviewed Leave Open If $\,A^k=0$ and $AB=BA$, then $\,\det(A+B)=\det B$
Jan
18
reviewed No Action Needed Two trigonometric eliminations
Jan
17
reviewed Approve Analysis of algorithms and recurrence relations
Jan
17
reviewed Approve Convergence of Recursive algorithms
Jan
17
reviewed Close How to find other nontrivial solutions of $a!b!=c!$?
Jan
16
reviewed No Action Needed X-infinite, consider zariski topology.
Jan
16
reviewed Close Topology, continuous mapping help!!
Jan
16
reviewed Leave Open IMO 1979 problem
Jan
16
reviewed Close Trivial question about a double summation
Jan
16
reviewed Reviewed Density function Find the constant a?
Jan
15
reviewed Leave Open An inequality with $a,b,c>0$
Jan
15
reviewed Close Why does $\sum_{n=1}^\infty \frac{1}{1000 \sqrt n}$ diverge?
Jan
15
reviewed No Action Needed Normal subgroups of direct product
Jan
14
reviewed Close How can you prove that “if $f$ and $g$ are surjective functions, $g\circ f$ will be surjective”?
Jan
14
reviewed Approve Playing around with ${\int\frac{dx}{x^2-2x}}$
Jan
14
reviewed No Action Needed Two sets with the same geometric and arithmetic means
Jan
14
reviewed No Action Needed Prove that the sum of two elements is equal third.